Move animation code to new ui/base/animation directory....

app/animation_container.cc

-// Copyright (c) 2010 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "app/animation_container.h"
-
-#include "app/animation_container_element.h"
-#include "app/animation_container_observer.h"
-
-using base::TimeDelta;
-using base::TimeTicks;
-
-AnimationContainer::AnimationContainer()
-    : last_tick_time_(TimeTicks::Now()),
-      observer_(NULL) {
-}
-
-AnimationContainer::~AnimationContainer() {
-  // The animations own us and stop themselves before being deleted. If
-  // elements_ is not empty, something is wrong.
-  DCHECK(elements_.empty());
-}
-
-void AnimationContainer::Start(AnimationContainerElement* element) {
-  DCHECK(elements_.count(element) == 0);  // Start should only be invoked if the
-                                          // element isn't running.
-
-  if (elements_.empty()) {
-    last_tick_time_ = TimeTicks::Now();
-    SetMinTimerInterval(element->GetTimerInterval());
-  } else if (element->GetTimerInterval() < min_timer_interval_) {
-    SetMinTimerInterval(element->GetTimerInterval());
-  }
-
-  element->SetStartTime(last_tick_time_);
-  elements_.insert(element);
-}
-
-void AnimationContainer::Stop(AnimationContainerElement* element) {
-  DCHECK(elements_.count(element) > 0);  // The element must be running.
-
-  elements_.erase(element);
-
-  if (elements_.empty()) {
-    timer_.Stop();
-    if (observer_)
-      observer_->AnimationContainerEmpty(this);
-  } else {
-    TimeDelta min_timer_interval = GetMinInterval();
-    if (min_timer_interval > min_timer_interval_)
-      SetMinTimerInterval(min_timer_interval);
-  }
-}
-
-void AnimationContainer::Run() {
-  // We notify the observer after updating all the elements. If all the elements
-  // are deleted as a result of updating then our ref count would go to zero and
-  // we would be deleted before we notify our observer. We add a reference to
-  // ourself here to make sure we're still valid after running all the elements.
-  scoped_refptr<AnimationContainer> this_ref(this);
-
-  TimeTicks current_time = TimeTicks::Now();
-
-  last_tick_time_ = current_time;
-
-  // Make a copy of the elements to iterate over so that if any elements are
-  // removed as part of invoking Step there aren't any problems.
-  Elements elements = elements_;
-
-  for (Elements::const_iterator i = elements.begin();
-       i != elements.end(); ++i) {
-    // Make sure the element is still valid.
-    if (elements_.find(*i) != elements_.end())
-      (*i)->Step(current_time);
-  }
-
-  if (observer_)
-    observer_->AnimationContainerProgressed(this);
-}
-
-void AnimationContainer::SetMinTimerInterval(base::TimeDelta delta) {
-  // This doesn't take into account how far along the current element is, but
-  // that shouldn't be a problem for uses of Animation/AnimationContainer.
-  timer_.Stop();
-  min_timer_interval_ = delta;
-  timer_.Start(min_timer_interval_, this, &AnimationContainer::Run);
-}
-
-TimeDelta AnimationContainer::GetMinInterval() {
-  DCHECK(!elements_.empty());
-
-  TimeDelta min;
-  Elements::const_iterator i = elements_.begin();
-  min = (*i)->GetTimerInterval();
-  for (++i; i != elements_.end(); ++i) {
-    if ((*i)->GetTimerInterval() < min)
-      min = (*i)->GetTimerInterval();
-  }
-  return min;
-}